George with the powder dry dirt your going to have under the slab I think your going to have cracks. The sad fact is it is going to move regardless of what you do to the pour. That being said I like fiber glass in floors IF your not wanting a really smooth finish. The fiber glass will stick up after it is finished and it will have wear off to be really smooth. The fiberglass will not stop deep cracks either. What it is very good for is shallow surface flaking and such. You also do not have to use as much rebar.
We just poured 3500 mix with 1/2 rebar on 3 foot centers, with fiber glass 5 1/2 inches deep, at my Grand daughter's. The rebar will keep the deep cracks from shifting levels and the fiberglass will keep the surface for flaking off. We just floated it off. We wanted a rough finish for livestock to walk on but not a broom finish.
The fiber glass is great for sidewalks. as the little rougher finish is not near as slick to walk on wet.
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Today's Featured Article - A Lifetime of David Brown Tractors - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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